package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetMealDishMapper setMealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    @Override
    @Transactional
    public void savewithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        //将DTO中的数据拷贝到Dish中
        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表插入一条数据
        dishMapper.insert(dish);
        Long dishId = dish.getId();
        //向菜品口味表插入数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && !flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            dishFlavorMapper.insertBatch(flavors);

        }
    }


    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 批量删除方法
     *
     * @param ids 需要删除的记录的ID列表
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除————是否存在起售中
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == 1) {
                //当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException("当前菜品处于起售中，不能删除");
            }
        }
        //当前菜品是否被套餐关联了
        List<Long> setMealIds = setMealDishMapper.getSetMealDishIds(ids);
        if (setMealIds != null && !setMealIds.isEmpty()) {
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException("当前菜品被套餐关联了，不能删除");
        }
        //删除菜品表中的菜品数据
//    for (Long id : ids) {
//        dishMapper.deleteById(id);
//        //删除菜品关联的菜品口味数据
//        dishFlavorMapper.deleteByDishId(id);
//    }
        //根据菜品id集合批量删除菜品数据
        dishMapper.deleteByIds(ids);
        //删除菜品关联的菜品口味数据
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据菜品ID获取包含口味信息的菜品视图对象（DishVO）。
     * <p>
     * 该方法用于根据给定的菜品ID查询对应的菜品信息，并包含该菜品的口味信息。
     * 返回的对象是DishVO类型，其中包含了菜品的基本信息和口味信息。
     *
     * @param id 菜品的唯一标识符（ID）
     * @return DishVO 包含菜品和口味信息的视图对象
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {

        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //将菜品数据和口味数据封装到DishVO对象中并返回
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }


    /**
     * 根据id修改菜品基本信息和对应口味信息
     *
     * @param dishDTO
     */
    @Override
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //修改菜品基本信息
        dishMapper.update(dish);
        //修改菜品口味信息
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //向菜品口味表插入数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && !flavors.isEmpty()) {
            //flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishDTO.getId()));
            for (DishFlavor flavor : flavors) {
                flavor.setDishId(dishDTO.getId());
            }
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 根据菜品分类id查询菜品
     *
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(long categoryId) {
        List<Dish> dishList = dishMapper.getByCategoryId(categoryId);
        return dishList;
    }

    /**
     * 条件查询菜品和口味
     *
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d, dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        if (Objects.equals(status, StatusConstant.DISABLE)) {
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            // select setmeal_id from setmeal_dish where dish_id in (?,?,?)
            List<Long> setmealIds = setMealDishMapper.getSetMealDishIds(dishIds);
            if (setmealIds != null && !setmealIds.isEmpty()) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }
}
